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https://issues.apache.org/jira/browse/HBASE-3680?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13141489#comment-13141489
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stack commented on HBASE-3680:
------------------------------
Forget it. I reverted this patch from TRUNK. It doesn't apply to 0.92.
Metrics have changed there in a way that is not similar to TRUNK. Will look
into this later. REVERT in the time being.
> Publish more metrics about mslab
> --------------------------------
>
> Key: HBASE-3680
> URL: https://issues.apache.org/jira/browse/HBASE-3680
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 0.90.1
> Reporter: Jean-Daniel Cryans
> Assignee: Todd Lipcon
> Fix For: 0.92.0
>
> Attachments: hbase-3680.txt, hbase-3680.txt
>
>
> We have been using mslab on all our clusters for a while now and it seems it
> tends to OOME or send us into GC loops of death a lot more than it used to.
> For example, one RS with mslab enabled and 7GB of heap died out of OOME this
> afternoon; it had .55GB in the block cache and 2.03GB in the memstores which
> doesn't account for much... but it could be that because of mslab a lot of
> space was lost in those incomplete 2MB blocks and without metrics we can't
> really tell. Compactions were running at the time of the OOME and I see block
> cache activity. The average load on that cluster is 531.
> We should at least publish the total size of all those blocks and maybe even
> take actions based on that (like force flushing).
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